diff --git a/erlang/apps/sim/src/sim_boolean.erl b/erlang/apps/sim/src/sim_boolean.erl
index 3af5ae5..b7e8493 100644
--- a/erlang/apps/sim/src/sim_boolean.erl
+++ b/erlang/apps/sim/src/sim_boolean.erl
@@ -49,6 +49,7 @@
         , handle_IORI/4
         , handle_IORM/4
         , handle_SETCA/4
+        , handle_SETCAB/4
         , handle_SETCAM/4
         , handle_SETMB/4
         , handle_SETMI/4
@@ -533,6 +534,14 @@ handle_SETCAM(Core, Mem, IR, EA) ->
   Word = (bnot CA) band ((1 bsl 36) - 1),
   handle_ANDM_1(Core, Mem, EA, Word).
 
+-spec handle_SETCAB(#core{}, sim_mem:mem(), IR :: word(), #ea{})
+      -> {#core{}, sim_mem:mem(), {ok, integer()} | {error, {module(), term()}}}.
+handle_SETCAB(Core, Mem, IR, EA) ->
+  AC = IR band 8#17,
+  CA = sim_core:get_ac(Core, AC),
+  Word = (bnot CA) band ((1 bsl 36) - 1),
+  handle_ANDB(Core, Mem, AC, EA, Word).
+
 %% Miscellaneous ===============================================================
 
 ea_address(#ea{section = Section, offset = Offset}) ->
diff --git a/erlang/apps/sim/src/sim_core.erl b/erlang/apps/sim/src/sim_core.erl
index 5812a96..07dd4cb 100644
--- a/erlang/apps/sim/src/sim_core.erl
+++ b/erlang/apps/sim/src/sim_core.erl
@@ -296,6 +296,7 @@ dispatch(Core, Mem, IR, EA) ->
     8#450 -> sim_boolean:handle_SETCA(Core, Mem, IR, EA);
     8#451 -> sim_boolean:handle_SETCA(Core, Mem, IR, EA); % SETCAI = SETCA
     8#452 -> sim_boolean:handle_SETCAM(Core, Mem, IR, EA);
+    8#453 -> sim_boolean:handle_SETCAB(Core, Mem, IR, EA);
     _ ->
       PC = (Core#core.pc_section bsl 18) bor Core#core.pc_offset,
       {Core, Mem, {error, {?MODULE, {dispatch, PC, IR, EA}}}}
diff --git a/erlang/apps/sim/test/sim_boolean_tests.erl b/erlang/apps/sim/test/sim_boolean_tests.erl
index ecb11a3..a39d838 100644
--- a/erlang/apps/sim/test/sim_boolean_tests.erl
+++ b/erlang/apps/sim/test/sim_boolean_tests.erl
@@ -87,6 +87,7 @@
 -define(OP_SETCA, 8#450).
 -define(OP_SETCAI, 8#451).
 -define(OP_SETCAM, 8#452).
+-define(OP_SETCAB, 8#453).
 
 %% 2.4 Boolean Functions =======================================================
 
@@ -610,6 +611,18 @@ setcam_test() ->
          [ {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(-1, 8#070707)} % C(1,,200) = -1,,070707
          ]).
 
+setcab_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVEI, 1, 0, 0, 8#707070)} % 1,,100/ MOVEI 1,707070
+    , {1, 8#101, ?INSN(?OP_SETCAB, 1, 0, 0, 8#200)}   % 1,,101/ SETCAB 1,200
+    , {1, 8#102, ?INSN_INVALID}                       % 1,,102/ <invalid>
+    , {1, 8#200, 0}                                   % 1,,200/ 0
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(-1, 8#070707)} % C(1,,200) = -1,,070707
+         , {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(-1, 8#070707)} % C(1,,200) = -1,,070707
+         ]).
+
 %% Common code to run short sequences ==========================================
 
 expect(Prog, ACs, ExpectedPC, ExpectedFlags, ExpectedEs) ->